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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '407b97f036f6989a9684970df117ec9176340849029fe6702a6b027082f6dc0f' 
  AND token = 'Ee2kocdwksPao98pWXfPuWUx9CSnpQnrWtTvzwDvcJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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