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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '858dea72af3100ef24a8c9ce6ce5a7ce0c10fadcdaca1f25b1a54df92e334764' 
  AND token = 'GsS+xD25u6B4xOJF++Czl1bjicI+6sTxrCgYK4/8Q2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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