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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2c11418f0f70dc003c706e0bf8f5e82515c61ac1f35fcbcab407d1252e375140' 
  AND token = '3GW7qnbWfuvgw4zhhqW0z616XYOKbgM3bXNu/7egoiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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