Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78698eb6b403bc46cb14703c0ad54238e200e9bfcc7201e00986396f2ad9b225' 
  AND token = 'CguiT12RG+9nwjSe2w1fDLM6Gg2+JfoECRXOtsNoDb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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