SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c1518379b1a1f1370998b7de63f97ca8077146f6b29cd0a17430f0efb53768d7' 
  AND token = 'K94ifC6bDmf/W6DZlCxvNJK1hKrEv4zJNvINr0GCxOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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