SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0b4754030d45b287ce3e904883a1c8be063d7fb027194813729fc0409ec5a10f' 
  AND token = 'yIw8WgmvTIfUO+x0hZDltaJbVYHFflDyp+aTas4ZUx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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