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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b2af20d77a1d2bd1d6315ebe323c817f17f9f9e1f9bf7bb2a69d1dc46ba30591' 
  AND token = 'TVhVwwP9jQ7lbOgbqOoCtAskDY6vOyTDrbKnWfVAXMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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