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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be377fc6f49fbceb7c57e0c484a9e5b48cfd84fc77b3ac451378969157b0b001' 
  AND token = 'vIvbxsuLl2ac67q8GM+Djl5CWQ858UWtDA/HYzuDghU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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