Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638e2e4c568a00d64afd78b6dfcd1504498b4d81105e7fda520e889e866acf64' 
  AND token = '1TcHkyCECiup2zasC+CPQQK8HAztA6gy2jgvhSvxrHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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