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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0694e1b15acfca749fddf57fadf1aef8e7b9719103f42fb81849945200058911' 
  AND token = 'diQaEERuXgaIY01Qpd64Go9THzou/tVklxP9O7Hm2yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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