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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cd4b6adb8c6b960b9df9549fdb8afc3e7fcf8a8d8d3c8194b2ed3c4b118cf77b' 
  AND token = 'YDP+nZ/KAjx082xnODUOmtf0IafobJABiLBDpPa6eVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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