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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7b9087e6ffa77663e7f10e4852420b82a7438bec93ff77d0075caf33c90f66f3' 
  AND token = 'r6wtDwa30vcMW+hsZXmTFjvoYROx08xaYbeKm25SZUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}