Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7940404f881376a91df76ad719f2cc0c815ad9a05696ea92e6264bc9cb7a2d88' 
  AND token = 'tpcBFHVMl5jIRjBwyMi1+Mp7HlSnNIXWSz6PvWY3IPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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