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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3eb898244198b3dd9dad83c5d382ab575151452783e79fdfafcc45dbf2420dfb' 
  AND token = 'neqSiCXZgcFc5P6uX/jlp7qcLb6SLyq0dGd0XffEYdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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