Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a2ceba2a7cf5a9a9bf94479cc32344feae73e8a315acd2bcf324fa91dfc96f' 
  AND token = 'J8QBjTXIZ2wCJnC23/fUsA0QvVeDl2HR6BhQiWR/gMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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