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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3a0c709d95c3609e0ba3377405beb65d3a0aca176f6b0dcca5731247bd31caf6' 
  AND token = 'lZioreKV1tYD69A1rYsPNhrTZUDR9yk75IfWSf5s/jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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