Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9192941c86df01be8d9e8e9c8b2ef763eb5dcbd6da4fd4109e23d2cdba26de17' 
  AND token = 'mpXEwJcmNBUnYv6FKpr8a7q97zHMRONJYR3SAgTNBtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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