Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6344520e8e5e05160c2df11df2ee64ed83720b01575b677363961062aab2c2b' 
  AND token = 'yp8IK1KenklfCv1Wi3T1G6YHCBoJnrs1IEtACmK3824=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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