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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '24155f119e2a0b24a7d925e6d1e0e661cb2166b64d7b52821948a6093988e64b' 
  AND token = 'Y8rXciazEFPy7cktUJrXqNYCyglzg0VIkNm7sVxVtXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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