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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '452bb986982b941e4bf3ca5d9e33a9ac2368c8da8f03d044f474fd32b3fd3e0e' 
  AND token = '5MBL5ZjxIoNSiDz5Q03J6iN9k8fq+WcPh7r+25Ra+ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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