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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dac5352ce7bda0a380f2ff9fa2fa2a5727e96f46c762bfe9d5d2ff69d71b339a' 
  AND token = 'CuhFKwIsR441gyD3bU/HH3RS+taBz7RE2rjv0TF5OJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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