Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602869b799c82f584f8db5e652b012a0f1003364295d363db6aa2980217b600b' 
  AND token = 'LxRyemgLsiXOYJj0FVHIlv6PB2LR9uqObg50k5FksjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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