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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fce6cc8a09246262ada8fa6edafeb49b10c6496d20614acbc666c51df95db6e4' 
  AND token = 'PvW/4z3HV7zD/9TFvf2wS133u+Y2V+GdCvV566uTxKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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