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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bca623d87adcb3bf38558f20fda7c76c05af3b50e3d10f76ac37adccf2dfbf30' 
  AND token = '9G37ngmYzlTUSLJXExmFes9MDqg5iqMP9ivSt6kJ9eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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