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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a1cd57d6ebafd885ad320ef22973c0d1aba3edd3d026cb4748c307b9218cab26' 
  AND token = '+nO8j92J4UohKd8ydeZZRfgMXUDDryOKZ3E0fc8jZhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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