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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '807ac36da3fae1e33a4e972d6ea2db1f12fc57ced16ece7ff1d36c71a857e2cf' 
  AND token = 'RqrFOgNWvHHEVOPSeew2PbTsestMOdP03EjGWnajU5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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