Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8857cf860337a400d47e1dbb530d026b88d27813755e020a76bfa38d5ca264' 
  AND token = 'daIgdUzzlFuvHdtbNbSGxVAe10SpkaEDLRX7fpyp9aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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