Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac10e01ffb22c73dbaefbfaf1d290c7bb8008d97e0bb22644a4c0e3b1f13d8c0' 
  AND token = 'Uj9Sg2tHtTWW9CtRnW44u9zaytHDS4NI/tiFtmoY2u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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