Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2129efaaa419d44ea10f8cc644fd7121f128885a04e67273a193723cdce68de0' 
  AND token = 'SvPFR/qm7RkD8Fz0xzrxo0ujXXMtAVANWrtd+BmfoOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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