Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc850a013a27ec0aa7779153d178046aec386f8580d4e1889fd564cf24cab913' 
  AND token = 'U4zCxK9kCT9f9+qOtT1TSNCeLFF3kamV+UBeXcZRWCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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