Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4b3c9d2ffd2d1a9412da6f6fbd2bab9ce596e4e18bb5a29678774d81335858' 
  AND token = 'NcuxMqO1dCKMXP1q/Wjdkau79U4dlEmnNwmxqyJEZ+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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