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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1aa0b0412e0155fe5f54ee76e4dada8dfb7f1ce18dac5f287b73c3e975052f88' 
  AND token = '9Y5wGHu630PYU0o8LmWxOSh4e0srFdB3cH4FdHdxTKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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