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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e447ae958d864d66c97c18a71aa0eb0385c39b562b581216e2c661119d747cda' 
  AND token = 'oQID5z0CBPDaa/N7MtHhEDM/BxjIxzAnDKY9xA3x2lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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