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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '244cdb29d1edddbc4bb2b1e1b0352929ca2497866c6094953ecff014a3d303c1' 
  AND token = 'PWLFrXOGa6g/w6QkBe59t+k/IXe3QxpNSf0glwBu4BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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