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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8db53db0900221e3ec91ac4b097a0793ebbc4fade552e87be1b0306e143fd462' 
  AND token = 'LNWN6S0nExExhOowrKkj/XJxQGEKk9xbziJDLxt+lZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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