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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3a2cf5447f5f3e7b6bf40f303c3b7ef489b38470e142ce77fb8229e41e80ff76' 
  AND token = '+etfbFpmQXFqgeYUhn8eV1Hnw286IJvA2HPOzbveVrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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