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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fbc7013f0d6ee3a0c9faa24ea1fda6af2ef9d479337cf4ede5bcff307d88aee0' 
  AND token = 'jz8LlMQaKlDOgOnrSye297npfVA41MfVgxfwYlZ9OH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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