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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '216285c8586a45b4b84b987af8d15b89b2fe9ead8a84f0c6d40bc5efe5bc574d' 
  AND token = 'ym9GPMsYAl3TynKH+YmpscGAOarNaUp18KOlsozruo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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