Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23bee6f4d3daa7d36bfb99586283d5275e88813b20172a009fc41d32861a2a2' 
  AND token = '5xoml7JzMzomveuSCaHN84UagSJrMdWP4kqhaBKHfTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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