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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7358e405e207abff687a91e70aee31afe091b0c34888a9f3aa17fad805d85f05' 
  AND token = '+fSsJV8kysGVu96+XrUq1o4tGsxXxlClbSiqrAQvKD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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