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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '92b2101dd2ce67709ee10e5095a594d641b3330c96ab0eb30c7805e3bd757fa8' 
  AND token = 'Ktm/6xkwRk8b5wTRWI2kFxgRK8wRN2EVYbo2OAIloy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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