SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '428b4255685c4d98e981d74ca639f23634b76a54a251e006457a8190f881b56c' 
  AND token = 'fBhVW7WbRvxCYfPereGYPR7yKXFAcpRwZvJuSWluxuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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