SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f868d0be712df26182e5b14b1e1c95f65b51da47f2009124a8319ade669010ec' 
  AND token = 'Q8pgsAH4vT+PFwIMOp+3LCgKKs8ejLBHP2AVC0iG+Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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