Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '346927ba5aa07a9fa5990c1d83da0e9b7670d0af9ddfce77282c77c159a5d2b7' 
  AND token = 'X03M4muoVymsz50bGnQiKoNUhVZ/T7iDgFUa03Q/Psk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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