SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f277a35fb343790e2d02e29daf4d1265dc78ceaa595cbe4e6e553613af2c31da' 
  AND token = 'kOh/e/z6FUVJZ9Fq+59MSVS0DodCrrUJiFpPJWxYFlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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