Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c3e0b71f1166d38b986d207b8eaf881e8d45f8702bf0f4e03152d0acbaa57e' 
  AND token = 'fVOQIvVGcBQvDsturoM3Xj+8CfRcM6aBVIO99XdwaFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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