Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08c3d0b411815e8d04bf714a1db36c368ccf24da7c2ad3d5dd48cc9f3642b24' 
  AND token = '3S9AcjYT1d4+mDAixKA1B+uSdt0k1gWyX2/p96T6jXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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