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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c87b2372b582810276066e3d38f8994c498f7c3126600aa95b65bd728ad23e2e' 
  AND token = 'L4TmQsL6odb1mBasLTSA/PFZaZB8C6TwE8lDTW6pesE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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