Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b292b8a573ff875d0b2169f91af5ccbbddb8d3a4503426583a591f543465e3b0' 
  AND token = 'uB2P+fopEfhni6bpshOJtWF9WCXpw4tUk/c3N1BTAEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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