SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f23a41c9525a55b643e4d80030c23d2d742b1e05aaa17d74df8bd01a71821edb' 
  AND token = 'qjSO/gTnNm5HurR0IJs4CQR5Z/VoXuhPl27V0vU3T6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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