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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '92de4cf1dbd838e9b571d78518578f1645b53d5eb8a5f58f4f7e6c40510339f8' 
  AND token = 'XUNM8/PFeZY/Xo8eAxzQbvw2dIw9GwY1XoeGf1KB/Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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