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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9deda2cc837a7223ad6fdc2c15742fe583ea0699701d3546c3a57b2dad2bd81b' 
  AND token = 'KJYRAqAVua5UxdpTPp5NvCx8bdcG6qzHxsbnpUuqXI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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