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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7f38fdbae211ab1c3f6efd0d45e6e68e88ede027fcf9fc2b25bcd56e2df8f4d8' 
  AND token = 'BVnKxl9RnsfgHt4nUw/Op24rHkEeMJwAP0sk1lDOXLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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