Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d0cd9cbaf5f24ad2ac2f58d13924c4db66d6f668dd0ebc16d53c07968a4c45' 
  AND token = 'cvi3IIMFOhg/65MJmXRP1ip5/CqHKF1gWyh2V6X3p38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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