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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0788136181ea280e08e71dbfc268e91fa8ce37863e3a365f742a2c19841c9e7b' 
  AND token = 'WS5C9jTRj+X5KbzXi3KE5mIILEDnOFvNLJ9pOt3oANw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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