Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1e9401f2b3c98f32706f38584aa88d656564b3f35593e1556e15f2a049371c' 
  AND token = 'uwezgvGtuqkI7xmc33u5I3UJi+RG7atsFh50lyDknXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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