Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a11180c6f5b6ba3ad6bb556fc3da1b185fea10328d2c67848aa53a64f14d52' 
  AND token = 'gGylg3+RLH1mUw3+Fw4laWh3OGwKuPvEOLd3LQz58Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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