SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a00c853fb115b51000ec4ba297e67a2187097cb46e31b8a55d99eb058b67abda' 
  AND token = 'FLOSbKhnVrphVjVkALBohjYM63v6AzJbPlLms4pCVp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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