Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3df99cbec6ee24e86fd2682cdb4f19c1da8ae261a403c5d2fdf94fc4b94b8c' 
  AND token = 'wuvACOAtWHQmNy+zsTl0U3IIVBaWhbNo/B8GrNKhSds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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