SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e253b21180d7949aa048604ba05678318cd32f0bbc804bf1f74ef9705709976d' 
  AND token = 'Tv1WgVYxnaUzXH6M3p78b6+DNfPWI5C+GDUtk/m/seE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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