SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a5147e4b6b7211f8dedd2bf471f75cb0928b0d8467b8aa99037fb7f3a4430347' 
  AND token = 'yIQW/VDvfw4Aw+zz152pUSqQnocB5a5d6SBh9hmMUHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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