Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c919ca1f5a5cb6a5f13d30ae4c517c6633f2ece044fb6a6445a996b59af675ad' 
  AND token = 'rjxfh/Q8LmU4yv/SAI/TeQz5wDTgId8xzgdiLEnAVNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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