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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dde91e8d972cd07078e2268b01ca1b7081712d3314580cdc3372e0f4323b060c' 
  AND token = 'tf3QFWGC4tk4xzMrA3tC8iqVFFyaQ4ZVu1FB2P3BjLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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