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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b35b200b9a42bed9a890be592d43329f3b79ec713665dc151e8a1044b24bd6a' 
  AND token = 'wkkbpFfCD58rQvdJK7C/sBaFWJxQYZ31e84b0K9mUoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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