Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96859bb38d81af34814b5264641b15e861a35fb0338ae39b53b3bdd9182d7cc6' 
  AND token = 'DEZnkgF4nO5Kc5r8FSHQ2eZ12ctsVnz4ARl0ZbSM5ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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