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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '735b1a609f70b89163f6c0ffe780513cabc71a6067701bf790f3ff99dcdd27cd' 
  AND token = '06RsGQjW2I60OVSh86FZToXua+5vXjAStBEaKbMRzyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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