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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9bc64a05b35b8df8048d94cd5d8acc54b2d4ce585ae57aabff358c27ed3523f1' 
  AND token = 'zrtt/EnJBwV3pETdzO2qBzwbOLI7EfgWA9BMO//QP2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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