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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '392bc7d8498ddb7bccae071b281340194464513a153900b37cdb10f0944a4f99' 
  AND token = 'JzttEslu8nLMJlTWq4E7D2V4cFJtq2WJLIEhaYKuHU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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