Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b12e19bb7c8c26bc199867ffdb368dc89450e2f95e557f17065dd4b4ca1ad5' 
  AND token = '0DbljexQLiHeGeHjnxwJV4rigwv+1/TVsrwrHK5Lcso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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