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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '40c760bd1feea34cb7c1fa1a58e7926adcfc5e5ea351a3e2db78187807da4f52' 
  AND token = 'HypjTomRkxaKSwUe4JYQLobrcOtUNChWiAbod3/mvJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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