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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bb4330a290a6606d6cc17a986ee6cc38927f0cdacaad4df8d29cf52847c3d36f' 
  AND token = '6B69yn91MyTqU9zlipHZ8t0gB9wzO/CiPxMqjauBNNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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