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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '11e20a114c55f10f3f0a0822b920c7c0ab97cc91e1be06fdc8c9ae56e5163a55' 
  AND token = 'o51ovJS3sAO0WATnIcEeWRK5A2MbctBLHfEnEGKZIl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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