Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87e3ffb98152226fc4ddfc0d2c1d0981d1fc7790afd3c70813ca36d5949cbe6' 
  AND token = 'cui8jGLOUfhzuXx7orDppKmydoEqJ9zQGCrbFBp4ErY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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