Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a298c2640a3d70bc1bc94e4cd5cb8ef88ab9485f40b0accd11220d313017a06' 
  AND token = '4FvzXVpfPcYYdf0DWI0MrcUqY6uqjPesLaRCcNhQwzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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