Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78303b7889fa3dc76d845655b7a03d8ac090c8b72d3f2646360322205711f5e2' 
  AND token = 'zlHAYgstHXMIuPtRMm/T8uXR9a3KGWdS67Eg+bESZNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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