Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e43058c33962384974ce997564154d3f010d77d00de6f9e9640f4e57a0491b' 
  AND token = '8odkoMLHVc72RTeUWFkt4WlLnUMLjRvWMC8hIzlU1Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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