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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd11543a79c22d284f9c69ae5fc3e9e2e5f516f629c0f2da3d1971a6354cb1e2' 
  AND token = 'ckauEA5/yMLp1Us7bN0csIVyBgfYTikkOq4HDzr8lvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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