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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'dd68103cb961b12d6a144dc7a811b25e18f00817e2aee26a8e9bb41768e88fd4' 
  AND token = 'gaG8WGV//P4LeG8bVUhVpm4RYFL8O76OJUQzOr9MZPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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