Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6bc85e756f419735776df40a6b5062b93f3808ea86c57a5fae3a3f77e24ece' 
  AND token = '+0hLl+fBXfpPIZ75TqdxRg8ANYxxZuU02EUtlq6z3Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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