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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '692eb8ba86dd413548aae6f98fdc90a3637708592e4176612b2e9c7f511f7e52' 
  AND token = 'u4KE7AtwH9n1cHdq0tyEP4Y66rLAsRB/Qm2SOax6J2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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