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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb2d8854e34a365da2830c11b0a8b6e1a8379fae42dd3fef171bf7b1fea5e9f2' 
  AND token = 'x0l2LCwkA0Szxa/VABrE9j5yphP07vSyOuPNypJ0vuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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