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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4d7e96fa269dbe8e4f53918a0ecea56621d2cac66cda619332f43a22bf6eff65' 
  AND token = 'tNEUNUnApMq5HhPiZ7e1SMz9J+GINTVFkRSvBAHFsgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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