Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681ce511641ed718dc6aa276618aa7e41b23b52ba24e09d49200ddef0203c4d4' 
  AND token = 'pJXe+sijYDy5HLIFhM296QP7P8NfVt+tUzcdKoBU1hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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