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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e42b2afdeef339077b80cf88331fa4f47430cab28f34b13ee2c9a3ceb338ab68' 
  AND token = 'Zzgj8lNgXXzbRw99WJLmqRnXmFuuwTjMYA4nZ4ns15o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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