Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68292292901b732cbc136c18cac2e057f1defdfd066cc8f47c5d9dfc42a1eb13' 
  AND token = 'uJ2G5b6mZc8D1GYSwghjn+ESzZ1PlyfGVrRCNcX+pwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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