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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '550dc729b9c65fe4cd91ad31174c0fbe5daae41328c5973006d65e68a853aa95' 
  AND token = 'QXKWxbdae1Di6jNrCoXRNCVSoNvgPkGavR450wZhsFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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