Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9c91a5f1c4456fa8f3d2eb4fcef3c1cb422c118970c6e80c6ff41da7663cf2' 
  AND token = 'korSUZotSiwEfBzNlfTOMn30sj+Xmbzt3K8T3xuCbAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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