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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e6b860605c0478a2728a32109c9f2f32a5f8ddd33bc50317e37e71a1b6067f3c' 
  AND token = 'DurVhtXswrwynnULdeLhsrMTyh++8gbrN/LPGF0fIkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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