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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c909f31796a28c340ac8d30bc8bf5f25ff9c70122bca5dae3e57d018941579c9' 
  AND token = '2bM3sL5wG0Ei2YtKFn3beWULV6aV+H8+l7cfFXOjZ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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