Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a739b7f83582b3bc63915c8c697f6c30afbccfd166af28bec05717c23d6c5306' 
  AND token = 'aoCQwExdVbfkeFSbBVyuGaf9qVXRbwIgAKagZZo8EY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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