Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0ef02ab7bfc026fbe2606901a6fbe7a80db8f486490fad20ad268dbd573259' 
  AND token = '5II09mmorxLbWofTu0w9fskb0GV+LEa34MF9eIx+tBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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