Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eebc1ea6b546df83d87194255daa33da0a9977e1f8c497056acd66d1e947ca5' 
  AND token = 'f6VrYgrljHyGXNgU/Y75dJy4FjJ2Yalrzh53KzrAj1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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