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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '42cf47c87b0590ebac001d2ba31eb12bb68dc3772ea051fbd75234026ab9d041' 
  AND token = 'Ib4JKcxoeONC+niPdS5NDc7D4dXfLjh5bta2NtBPyOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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