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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1001f36c173e255cc05077e6d4032ecc8ffec4d406b917ce293f4665aeda4c8d' 
  AND token = '415ln0KpoQl2UM9mDyLNQvY2za7GrKpx87iNOLMRj1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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