SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ce54bac43b4261b7a6212843bd55f2cb387068aa6a8f35f284df847425132d64' 
  AND token = 'mijLklbYNYkr2ZcvXKLFW2uOURJBZpvNVAguJPjc2Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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