Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638b5aef164bf3a71b9f4041d76bde400e0a5dd796dcf43b00c44a5d0a49906c' 
  AND token = 'sbWeYEO8ErbGYyRBbJg9hqvdjXIp2iHcNcEJCQBAQNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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