Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ab8da6655f05128ba782939a33831f53b6bc61f53f268f645aaff76ab12dba' 
  AND token = 'sk5bpfuSqyvAV+krrFItN2Q9u4SMDEUCiwf9tttR168=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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