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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '002b0cac0e648ad7e09e97e18146e5a63ee1ca46368d379019ead9d90b0e5838' 
  AND token = 'Wa59mvcm/nZKYmrGUjrzRKi1qG/35S+7+5cfprll/QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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