SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '041d51b33b01eff60e611422a3878c5b2b9e56365c7899df4071fcdb8b124261' 
  AND token = 'Bo8S3rNTEcmjqaNePqGJ/qYkbUgHoQPyTDInHjU/i6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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