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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9847b3a7699cc66d224f783668ca2336559125238b65e9721975c493308022ea' 
  AND token = 'CXCJU0EN1uFuEcPOARICs+VeJ2Yzwli69YymoJi0Hk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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