Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1d52dd8a8938bf4d61a596b4d6f11caebdb055a180e5571e136b0199496fee' 
  AND token = 'oRPRxyE41Jf+McBZELDUf4y4E7lXBu8imM1q5fAFCNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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