SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5dea37f5b74374bec3f87e55cc536646f6ac82b5e00cf3fcd6985905cdb8f622' 
  AND token = 'BblwJ9b8CIUG/1/yCJYivVSXdnsedwVpl+o1QE0MEcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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