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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d4688f7403d8e6e162ff54f9d16cada6db74334260c083dc093ee39d6df7db3' 
  AND token = 'DU8OY+uAuuxpc7VzTUXtaOAxHKF3x9vc9wbxvKmOLi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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