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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '181d43851383259f022caacd8ae8ad199f40dbbec32cd2ba97b7f9f558c8d00b' 
  AND token = 'KNbut05l5QQZ5rInHU4YtIl6Qs69lxqkhk6P71wPfUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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